public class main {
	public static void main(String[] a) {
		String s = "hello";
		System.out.println("s is: " + s);
		s = duplicateString(s);
		System.out.println("s is: " + s);
		updateString(s);
		System.out.println("s is: " + s);
	}

	public static String duplicateString(String z) {
		String result = z + z;
		return result;
	}

	public static void updateString(String str) {
		str = "updated!";
	}
}